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NASA - Deep Impact: Quick Facts
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NASA - Deep Impact: Quick Facts

Flyby Spacecraft
Dimensions: 3.3 meters (10.8 feet) long, 1.7 meters (5.6 feet) wide, and 2.3 meters
(7.5 feet) high
Weight: 601 kilograms (1,325 pounds) at launch, consisting of 515 kilograms
(1,135 pounds) spacecraft and 86 kg (190 lbs) fuel
Power: 2.8-meter-by-2.8-meter (9-foot-by-9 foot) solar panel providing up to 750 watts,
depending on distance from Sun. Power storage via small 16-amp-hour
rechargeable nickel hydrogen battery
Impactor
Dimensions: 1 meter (39 inches) long, 1 meter (39 inches) in diameter
Weight: 372 kilograms (820 pounds) at launch, consisting of 364 kilograms (802
pounds) spacecraft and 8 kilograms (17 pounds) of fuel
Power: Non-rechargeable 250-amp-hour battery
Comet Tempel 1
Nucleus shape: Elongated, irregular
Nucleus size (estimated): 14 by 4.6 by 4.6 kilometers (9 by 3 by 3 miles)
Nucleus mass: Unknown; possibly about 1 trillion kilograms (roughly 1 billion tons)
Nucleus rotation period: About 41.85 hours
Nucleus composition: Theory and observations of other comets suggest silicate dust
(~25%), organics (~25%), ices (40%), other material (10%)
Mission
Launch: Jan. 12, 2005
Launch site: Cape Canaveral Air Force Station, Florida
Launch vehicle: Delta II 7925 with Star 48 upper stage
Earth-comet distance at time of launch: 267 million kilometers (166 million miles)
Comet impact: 1:52 a.m. EDT July 4, 2005 (time subject to adjustment)
Earth-comet distance at time of impact: 133.6 million kilometers (83 million miles)
Total distance traveled by spacecraft from Earth to comet: 431 million kilometers
(268 million miles)
Closing speed of impactor relative to comet nucleus at time of impact: 37,100 kilometers per hour (23,000 miles per hour)
End of mission: Aug. 3, 2005 (30 days after impact)
Program
Cost: $333 million total (including launch vehicle)

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